The Adsorption and Tribological Behavior of DMTD at the Self-Mated Ti-DLC Sliding Interface

In this work, the Ti-DLC film was prepared with the unbalance magnetron sputtering technique. Then, the Xray diffraction and scanning electron microscopy were carried to identify the micro-structure and the cross-section morphology of the prepared film. The friction behavior of the Ti-DLC/DMTD combination was evaluated by a CSM tribometer. X-ray photoelectron spectrometer as well as the theoretical calculation enabled us to draw a conclusion that DMTD adsorbed on the sliding interface though its excocyclic mercapto-S, and the adsorption was controlled by the diffusion of additive and irrelevant for surface coverage, which is coincided with Langmuir adsorption model. And the possible reason for the different adsorption behavior of liquid and gaseous molecules was also discussed.